BookStack/app/Services/RestrictionService.php

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<?php namespace BookStack\Services;
use BookStack\Entity;
class RestrictionService
{
protected $userRoles;
protected $isAdmin;
protected $currentAction;
/**
* RestrictionService constructor.
*/
public function __construct()
{
$user = auth()->user();
$this->userRoles = $user ? auth()->user()->roles->pluck('id') : [];
$this->isAdmin = $user ? auth()->user()->hasRole('admin') : false;
}
/**
* Checks if an entity has a restriction set upon it.
* @param Entity $entity
* @param $action
* @return bool
*/
public function checkIfEntityRestricted(Entity $entity, $action)
{
if ($this->isAdmin) return true;
$this->currentAction = $action;
$baseQuery = $entity->where('id', '=', $entity->id);
if ($entity->isA('page')) {
return $this->pageRestrictionQuery($baseQuery)->count() > 0;
} elseif ($entity->isA('chapter')) {
return $this->chapterRestrictionQuery($baseQuery)->count() > 0;
} elseif ($entity->isA('book')) {
return $this->bookRestrictionQuery($baseQuery)->count() > 0;
}
return false;
}
/**
* Add restrictions for a page query
* @param $query
* @param string $action
* @return mixed
*/
public function enforcePageRestrictions($query, $action = 'view')
{
if ($this->isAdmin) return $query;
$this->currentAction = $action;
return $this->pageRestrictionQuery($query);
}
/**
* The base query for restricting pages.
* @param $query
* @return mixed
*/
private function pageRestrictionQuery($query)
{
return $query->where(function ($parentWhereQuery) {
$parentWhereQuery
// (Book & chapter & page) or (Book & page & NO CHAPTER) unrestricted
->where(function ($query) {
$query->where(function ($query) {
$query->whereExists(function ($query) {
$query->select('*')->from('chapters')
->whereRaw('chapters.id=pages.chapter_id')
->where('restricted', '=', false);
})->whereExists(function ($query) {
$query->select('*')->from('books')
->whereRaw('books.id=pages.book_id')
->where('restricted', '=', false);
})->where('restricted', '=', false);
})->orWhere(function ($query) {
$query->where('restricted', '=', false)->where('chapter_id', '=', 0)
->whereExists(function ($query) {
$query->select('*')->from('books')
->whereRaw('books.id=pages.book_id')
->where('restricted', '=', false);
});
});
})
// Page unrestricted, Has no chapter & book has accepted restrictions
->orWhere(function ($query) {
$query->where('restricted', '=', false)
->whereExists(function ($query) {
$query->select('*')->from('chapters')
->whereRaw('chapters.id=pages.chapter_id');
}, 'and', true)
->whereExists(function ($query) {
$query->select('*')->from('books')
->whereRaw('books.id=pages.book_id')
->whereExists(function ($query) {
$this->checkRestrictionsQuery($query, 'books', 'Book');
});
});
})
// Page unrestricted, Has an unrestricted chapter & book has accepted restrictions
->orWhere(function ($query) {
$query->where('restricted', '=', false)
->whereExists(function ($query) {
$query->select('*')->from('chapters')
->whereRaw('chapters.id=pages.chapter_id')->where('restricted', '=', false);
})
->whereExists(function ($query) {
$query->select('*')->from('books')
->whereRaw('books.id=pages.book_id')
->whereExists(function ($query) {
$this->checkRestrictionsQuery($query, 'books', 'Book');
});
});
})
// Page unrestricted, Has a chapter with accepted permissions
->orWhere(function ($query) {
$query->where('restricted', '=', false)
->whereExists(function ($query) {
$query->select('*')->from('chapters')
->whereRaw('chapters.id=pages.chapter_id')
->where('restricted', '=', true)
->whereExists(function ($query) {
$this->checkRestrictionsQuery($query, 'chapters', 'Chapter');
});
});
})
// Page has accepted permissions
->orWhereExists(function ($query) {
$this->checkRestrictionsQuery($query, 'pages', 'Page');
});
});
}
/**
* Add on permission restrictions to a chapter query.
* @param $query
* @param string $action
* @return mixed
*/
public function enforceChapterRestrictions($query, $action = 'view')
{
if ($this->isAdmin) return $query;
$this->currentAction = $action;
return $this->chapterRestrictionQuery($query);
}
/**
* The base query for restricting chapters.
* @param $query
* @return mixed
*/
private function chapterRestrictionQuery($query)
{
return $query->where(function ($parentWhereQuery) {
$parentWhereQuery
// Book & chapter unrestricted
->where(function ($query) {
$query->where('restricted', '=', false)->whereExists(function ($query) {
$query->select('*')->from('books')
->whereRaw('books.id=chapters.book_id')
->where('restricted', '=', false);
});
})
// Chapter unrestricted & book has accepted restrictions
->orWhere(function ($query) {
$query->where('restricted', '=', false)
->whereExists(function ($query) {
$query->select('*')->from('books')
->whereRaw('books.id=chapters.book_id')
->whereExists(function ($query) {
$this->checkRestrictionsQuery($query, 'books', 'Book');
});
});
})
// Chapter has accepted permissions
->orWhereExists(function ($query) {
$this->checkRestrictionsQuery($query, 'chapters', 'Chapter');
});
});
}
/**
* Add restrictions to a book query.
* @param $query
* @param string $action
* @return mixed
*/
public function enforceBookRestrictions($query, $action = 'view')
{
if ($this->isAdmin) return $query;
$this->currentAction = $action;
return $this->bookRestrictionQuery($query);
}
/**
* The base query for restricting books.
* @param $query
* @return mixed
*/
private function bookRestrictionQuery($query)
{
return $query->where(function ($parentWhereQuery) {
$parentWhereQuery
->where('restricted', '=', false)
->orWhere(function ($query) {
$query->where('restricted', '=', true)->whereExists(function ($query) {
$this->checkRestrictionsQuery($query, 'books', 'Book');
});
});
});
}
/**
* Filter items that have entities set a a polymorphic relation.
* @param $query
* @param string $tableName
* @param string $entityIdColumn
* @param string $entityTypeColumn
* @return mixed
*/
public function filterRestrictedEntityRelations($query, $tableName, $entityIdColumn, $entityTypeColumn)
{
if ($this->isAdmin) return $query;
$this->currentAction = 'view';
$tableDetails = ['tableName' => $tableName, 'entityIdColumn' => $entityIdColumn, 'entityTypeColumn' => $entityTypeColumn];
return $query->where(function ($query) use ($tableDetails) {
$query->where(function ($query) use (&$tableDetails) {
$query->where($tableDetails['entityTypeColumn'], '=', 'BookStack\Page')
->whereExists(function ($query) use (&$tableDetails) {
$query->select('*')->from('pages')->whereRaw('pages.id=' . $tableDetails['tableName'] . '.' . $tableDetails['entityIdColumn'])
->where(function ($query) {
$this->pageRestrictionQuery($query);
});
});
})->orWhere(function ($query) use (&$tableDetails) {
$query->where($tableDetails['entityTypeColumn'], '=', 'BookStack\Book')->whereExists(function ($query) use (&$tableDetails) {
$query->select('*')->from('books')->whereRaw('books.id=' . $tableDetails['tableName'] . '.' . $tableDetails['entityIdColumn'])
->where(function ($query) {
$this->bookRestrictionQuery($query);
});
});
})->orWhere(function ($query) use (&$tableDetails) {
$query->where($tableDetails['entityTypeColumn'], '=', 'BookStack\Chapter')->whereExists(function ($query) use (&$tableDetails) {
$query->select('*')->from('chapters')->whereRaw('chapters.id=' . $tableDetails['tableName'] . '.' . $tableDetails['entityIdColumn'])
->where(function ($query) {
$this->chapterRestrictionQuery($query);
});
});
});
});
}
/**
* The query to check the restrictions on an entity.
* @param $query
* @param $tableName
* @param $modelName
*/
private function checkRestrictionsQuery($query, $tableName, $modelName)
{
$query->select('*')->from('restrictions')
->whereRaw('restrictions.restrictable_id=' . $tableName . '.id')
->where('restrictions.restrictable_type', '=', 'BookStack\\' . $modelName)
->where('restrictions.action', '=', $this->currentAction)
->whereIn('restrictions.role_id', $this->userRoles);
}
}